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Commit | Line | Data |
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1da177e4 | 1 | /* |
1da177e4 LT |
2 | * |
3 | * Copyright (C) 1995 Linus Torvalds | |
4 | * | |
5 | * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999 | |
6 | */ | |
7 | ||
1da177e4 LT |
8 | #include <linux/signal.h> |
9 | #include <linux/sched.h> | |
10 | #include <linux/kernel.h> | |
11 | #include <linux/errno.h> | |
12 | #include <linux/string.h> | |
13 | #include <linux/types.h> | |
14 | #include <linux/ptrace.h> | |
15 | #include <linux/mman.h> | |
16 | #include <linux/mm.h> | |
17 | #include <linux/hugetlb.h> | |
18 | #include <linux/swap.h> | |
19 | #include <linux/smp.h> | |
20 | #include <linux/init.h> | |
21 | #include <linux/highmem.h> | |
22 | #include <linux/pagemap.h> | |
cfb80c9e | 23 | #include <linux/pci.h> |
6fb14755 | 24 | #include <linux/pfn.h> |
c9cf5528 | 25 | #include <linux/poison.h> |
1da177e4 | 26 | #include <linux/bootmem.h> |
a9ce6bc1 | 27 | #include <linux/memblock.h> |
1da177e4 | 28 | #include <linux/proc_fs.h> |
05039b92 | 29 | #include <linux/memory_hotplug.h> |
27d99f7e | 30 | #include <linux/initrd.h> |
55b2355e | 31 | #include <linux/cpumask.h> |
5a0e3ad6 | 32 | #include <linux/gfp.h> |
1da177e4 | 33 | |
f832ff18 | 34 | #include <asm/asm.h> |
46eaa670 | 35 | #include <asm/bios_ebda.h> |
1da177e4 | 36 | #include <asm/processor.h> |
7c0f6ba6 | 37 | #include <linux/uaccess.h> |
1da177e4 LT |
38 | #include <asm/pgtable.h> |
39 | #include <asm/dma.h> | |
40 | #include <asm/fixmap.h> | |
66441bd3 | 41 | #include <asm/e820/api.h> |
1da177e4 | 42 | #include <asm/apic.h> |
8550eb99 | 43 | #include <asm/bugs.h> |
1da177e4 LT |
44 | #include <asm/tlb.h> |
45 | #include <asm/tlbflush.h> | |
c10d1e26 | 46 | #include <asm/olpc_ofw.h> |
a5a19c63 | 47 | #include <asm/pgalloc.h> |
1da177e4 | 48 | #include <asm/sections.h> |
b239fb25 | 49 | #include <asm/paravirt.h> |
551889a6 | 50 | #include <asm/setup.h> |
d1163651 | 51 | #include <asm/set_memory.h> |
2b72394e | 52 | #include <asm/page_types.h> |
92a0f81d | 53 | #include <asm/cpu_entry_area.h> |
4fcb2083 | 54 | #include <asm/init.h> |
1da177e4 | 55 | |
5c51bdbe YL |
56 | #include "mm_internal.h" |
57 | ||
1da177e4 LT |
58 | unsigned long highstart_pfn, highend_pfn; |
59 | ||
dc16ecf7 | 60 | bool __read_mostly __vmalloc_start_set = false; |
4e29684c | 61 | |
1da177e4 LT |
62 | /* |
63 | * Creates a middle page table and puts a pointer to it in the | |
64 | * given global directory entry. This only returns the gd entry | |
65 | * in non-PAE compilation mode, since the middle layer is folded. | |
66 | */ | |
67 | static pmd_t * __init one_md_table_init(pgd_t *pgd) | |
68 | { | |
e0c4f675 | 69 | p4d_t *p4d; |
1da177e4 LT |
70 | pud_t *pud; |
71 | pmd_t *pmd_table; | |
8550eb99 | 72 | |
1da177e4 | 73 | #ifdef CONFIG_X86_PAE |
b239fb25 | 74 | if (!(pgd_val(*pgd) & _PAGE_PRESENT)) { |
4e37a890 | 75 | pmd_table = (pmd_t *)alloc_low_page(); |
6944a9c8 | 76 | paravirt_alloc_pmd(&init_mm, __pa(pmd_table) >> PAGE_SHIFT); |
b239fb25 | 77 | set_pgd(pgd, __pgd(__pa(pmd_table) | _PAGE_PRESENT)); |
e0c4f675 KS |
78 | p4d = p4d_offset(pgd, 0); |
79 | pud = pud_offset(p4d, 0); | |
8550eb99 | 80 | BUG_ON(pmd_table != pmd_offset(pud, 0)); |
a376f30a Z |
81 | |
82 | return pmd_table; | |
b239fb25 JF |
83 | } |
84 | #endif | |
e0c4f675 KS |
85 | p4d = p4d_offset(pgd, 0); |
86 | pud = pud_offset(p4d, 0); | |
1da177e4 | 87 | pmd_table = pmd_offset(pud, 0); |
8550eb99 | 88 | |
1da177e4 LT |
89 | return pmd_table; |
90 | } | |
91 | ||
92 | /* | |
93 | * Create a page table and place a pointer to it in a middle page | |
8550eb99 | 94 | * directory entry: |
1da177e4 LT |
95 | */ |
96 | static pte_t * __init one_page_table_init(pmd_t *pmd) | |
97 | { | |
b239fb25 | 98 | if (!(pmd_val(*pmd) & _PAGE_PRESENT)) { |
4e37a890 | 99 | pte_t *page_table = (pte_t *)alloc_low_page(); |
b239fb25 | 100 | |
6944a9c8 | 101 | paravirt_alloc_pte(&init_mm, __pa(page_table) >> PAGE_SHIFT); |
1da177e4 | 102 | set_pmd(pmd, __pmd(__pa(page_table) | _PAGE_TABLE)); |
b239fb25 | 103 | BUG_ON(page_table != pte_offset_kernel(pmd, 0)); |
1da177e4 | 104 | } |
509a80c4 | 105 | |
1da177e4 LT |
106 | return pte_offset_kernel(pmd, 0); |
107 | } | |
108 | ||
458a3e64 | 109 | pmd_t * __init populate_extra_pmd(unsigned long vaddr) |
11124411 TH |
110 | { |
111 | int pgd_idx = pgd_index(vaddr); | |
112 | int pmd_idx = pmd_index(vaddr); | |
458a3e64 TH |
113 | |
114 | return one_md_table_init(swapper_pg_dir + pgd_idx) + pmd_idx; | |
115 | } | |
116 | ||
117 | pte_t * __init populate_extra_pte(unsigned long vaddr) | |
118 | { | |
119 | int pte_idx = pte_index(vaddr); | |
11124411 TH |
120 | pmd_t *pmd; |
121 | ||
458a3e64 TH |
122 | pmd = populate_extra_pmd(vaddr); |
123 | return one_page_table_init(pmd) + pte_idx; | |
11124411 TH |
124 | } |
125 | ||
719272c4 YL |
126 | static unsigned long __init |
127 | page_table_range_init_count(unsigned long start, unsigned long end) | |
128 | { | |
129 | unsigned long count = 0; | |
130 | #ifdef CONFIG_HIGHMEM | |
131 | int pmd_idx_kmap_begin = fix_to_virt(FIX_KMAP_END) >> PMD_SHIFT; | |
132 | int pmd_idx_kmap_end = fix_to_virt(FIX_KMAP_BEGIN) >> PMD_SHIFT; | |
133 | int pgd_idx, pmd_idx; | |
134 | unsigned long vaddr; | |
135 | ||
136 | if (pmd_idx_kmap_begin == pmd_idx_kmap_end) | |
137 | return 0; | |
138 | ||
139 | vaddr = start; | |
140 | pgd_idx = pgd_index(vaddr); | |
9962eea9 | 141 | pmd_idx = pmd_index(vaddr); |
719272c4 YL |
142 | |
143 | for ( ; (pgd_idx < PTRS_PER_PGD) && (vaddr != end); pgd_idx++) { | |
144 | for (; (pmd_idx < PTRS_PER_PMD) && (vaddr != end); | |
145 | pmd_idx++) { | |
146 | if ((vaddr >> PMD_SHIFT) >= pmd_idx_kmap_begin && | |
147 | (vaddr >> PMD_SHIFT) <= pmd_idx_kmap_end) | |
148 | count++; | |
149 | vaddr += PMD_SIZE; | |
150 | } | |
151 | pmd_idx = 0; | |
152 | } | |
153 | #endif | |
154 | return count; | |
155 | } | |
156 | ||
a3c6018e | 157 | static pte_t *__init page_table_kmap_check(pte_t *pte, pmd_t *pmd, |
719272c4 YL |
158 | unsigned long vaddr, pte_t *lastpte, |
159 | void **adr) | |
a3c6018e JB |
160 | { |
161 | #ifdef CONFIG_HIGHMEM | |
162 | /* | |
163 | * Something (early fixmap) may already have put a pte | |
164 | * page here, which causes the page table allocation | |
165 | * to become nonlinear. Attempt to fix it, and if it | |
166 | * is still nonlinear then we have to bug. | |
167 | */ | |
168 | int pmd_idx_kmap_begin = fix_to_virt(FIX_KMAP_END) >> PMD_SHIFT; | |
169 | int pmd_idx_kmap_end = fix_to_virt(FIX_KMAP_BEGIN) >> PMD_SHIFT; | |
170 | ||
171 | if (pmd_idx_kmap_begin != pmd_idx_kmap_end | |
172 | && (vaddr >> PMD_SHIFT) >= pmd_idx_kmap_begin | |
719272c4 | 173 | && (vaddr >> PMD_SHIFT) <= pmd_idx_kmap_end) { |
a3c6018e JB |
174 | pte_t *newpte; |
175 | int i; | |
176 | ||
c464573c | 177 | BUG_ON(after_bootmem); |
719272c4 | 178 | newpte = *adr; |
a3c6018e JB |
179 | for (i = 0; i < PTRS_PER_PTE; i++) |
180 | set_pte(newpte + i, pte[i]); | |
719272c4 | 181 | *adr = (void *)(((unsigned long)(*adr)) + PAGE_SIZE); |
a3c6018e JB |
182 | |
183 | paravirt_alloc_pte(&init_mm, __pa(newpte) >> PAGE_SHIFT); | |
184 | set_pmd(pmd, __pmd(__pa(newpte)|_PAGE_TABLE)); | |
185 | BUG_ON(newpte != pte_offset_kernel(pmd, 0)); | |
186 | __flush_tlb_all(); | |
187 | ||
188 | paravirt_release_pte(__pa(pte) >> PAGE_SHIFT); | |
189 | pte = newpte; | |
190 | } | |
191 | BUG_ON(vaddr < fix_to_virt(FIX_KMAP_BEGIN - 1) | |
192 | && vaddr > fix_to_virt(FIX_KMAP_END) | |
193 | && lastpte && lastpte + PTRS_PER_PTE != pte); | |
194 | #endif | |
195 | return pte; | |
196 | } | |
197 | ||
1da177e4 | 198 | /* |
8550eb99 | 199 | * This function initializes a certain range of kernel virtual memory |
1da177e4 LT |
200 | * with new bootmem page tables, everywhere page tables are missing in |
201 | * the given range. | |
8550eb99 IM |
202 | * |
203 | * NOTE: The pagetables are allocated contiguous on the physical space | |
204 | * so we can cache the place of the first one and move around without | |
1da177e4 LT |
205 | * checking the pgd every time. |
206 | */ | |
8550eb99 IM |
207 | static void __init |
208 | page_table_range_init(unsigned long start, unsigned long end, pgd_t *pgd_base) | |
1da177e4 | 209 | { |
1da177e4 LT |
210 | int pgd_idx, pmd_idx; |
211 | unsigned long vaddr; | |
8550eb99 IM |
212 | pgd_t *pgd; |
213 | pmd_t *pmd; | |
a3c6018e | 214 | pte_t *pte = NULL; |
719272c4 YL |
215 | unsigned long count = page_table_range_init_count(start, end); |
216 | void *adr = NULL; | |
217 | ||
218 | if (count) | |
219 | adr = alloc_low_pages(count); | |
1da177e4 LT |
220 | |
221 | vaddr = start; | |
222 | pgd_idx = pgd_index(vaddr); | |
223 | pmd_idx = pmd_index(vaddr); | |
224 | pgd = pgd_base + pgd_idx; | |
225 | ||
226 | for ( ; (pgd_idx < PTRS_PER_PGD) && (vaddr != end); pgd++, pgd_idx++) { | |
b239fb25 JF |
227 | pmd = one_md_table_init(pgd); |
228 | pmd = pmd + pmd_index(vaddr); | |
8550eb99 IM |
229 | for (; (pmd_idx < PTRS_PER_PMD) && (vaddr != end); |
230 | pmd++, pmd_idx++) { | |
a3c6018e | 231 | pte = page_table_kmap_check(one_page_table_init(pmd), |
719272c4 | 232 | pmd, vaddr, pte, &adr); |
1da177e4 LT |
233 | |
234 | vaddr += PMD_SIZE; | |
235 | } | |
236 | pmd_idx = 0; | |
237 | } | |
238 | } | |
239 | ||
240 | static inline int is_kernel_text(unsigned long addr) | |
241 | { | |
5bd5a452 | 242 | if (addr >= (unsigned long)_text && addr <= (unsigned long)__init_end) |
1da177e4 LT |
243 | return 1; |
244 | return 0; | |
245 | } | |
246 | ||
247 | /* | |
8550eb99 IM |
248 | * This maps the physical memory to kernel virtual address space, a total |
249 | * of max_low_pfn pages, by creating page tables starting from address | |
250 | * PAGE_OFFSET: | |
1da177e4 | 251 | */ |
e53fb04f PE |
252 | unsigned long __init |
253 | kernel_physical_mapping_init(unsigned long start, | |
254 | unsigned long end, | |
255 | unsigned long page_size_mask) | |
1da177e4 | 256 | { |
e53fb04f | 257 | int use_pse = page_size_mask == (1<<PG_LEVEL_2M); |
c1fd1b43 | 258 | unsigned long last_map_addr = end; |
e53fb04f | 259 | unsigned long start_pfn, end_pfn; |
e7179853 | 260 | pgd_t *pgd_base = swapper_pg_dir; |
8550eb99 | 261 | int pgd_idx, pmd_idx, pte_ofs; |
1da177e4 LT |
262 | unsigned long pfn; |
263 | pgd_t *pgd; | |
264 | pmd_t *pmd; | |
265 | pte_t *pte; | |
a2699e47 SS |
266 | unsigned pages_2m, pages_4k; |
267 | int mapping_iter; | |
268 | ||
e53fb04f PE |
269 | start_pfn = start >> PAGE_SHIFT; |
270 | end_pfn = end >> PAGE_SHIFT; | |
271 | ||
a2699e47 SS |
272 | /* |
273 | * First iteration will setup identity mapping using large/small pages | |
274 | * based on use_pse, with other attributes same as set by | |
275 | * the early code in head_32.S | |
276 | * | |
277 | * Second iteration will setup the appropriate attributes (NX, GLOBAL..) | |
278 | * as desired for the kernel identity mapping. | |
279 | * | |
280 | * This two pass mechanism conforms to the TLB app note which says: | |
281 | * | |
282 | * "Software should not write to a paging-structure entry in a way | |
283 | * that would change, for any linear address, both the page size | |
284 | * and either the page frame or attributes." | |
285 | */ | |
286 | mapping_iter = 1; | |
1da177e4 | 287 | |
16bf9226 | 288 | if (!boot_cpu_has(X86_FEATURE_PSE)) |
a04ad82d | 289 | use_pse = 0; |
1da177e4 | 290 | |
a2699e47 SS |
291 | repeat: |
292 | pages_2m = pages_4k = 0; | |
a04ad82d YL |
293 | pfn = start_pfn; |
294 | pgd_idx = pgd_index((pfn<<PAGE_SHIFT) + PAGE_OFFSET); | |
295 | pgd = pgd_base + pgd_idx; | |
1da177e4 LT |
296 | for (; pgd_idx < PTRS_PER_PGD; pgd++, pgd_idx++) { |
297 | pmd = one_md_table_init(pgd); | |
8550eb99 | 298 | |
a04ad82d YL |
299 | if (pfn >= end_pfn) |
300 | continue; | |
301 | #ifdef CONFIG_X86_PAE | |
302 | pmd_idx = pmd_index((pfn<<PAGE_SHIFT) + PAGE_OFFSET); | |
303 | pmd += pmd_idx; | |
304 | #else | |
305 | pmd_idx = 0; | |
306 | #endif | |
307 | for (; pmd_idx < PTRS_PER_PMD && pfn < end_pfn; | |
f3f20de8 | 308 | pmd++, pmd_idx++) { |
8550eb99 | 309 | unsigned int addr = pfn * PAGE_SIZE + PAGE_OFFSET; |
1da177e4 | 310 | |
8550eb99 IM |
311 | /* |
312 | * Map with big pages if possible, otherwise | |
313 | * create normal page tables: | |
314 | */ | |
a04ad82d | 315 | if (use_pse) { |
8550eb99 | 316 | unsigned int addr2; |
f3f20de8 | 317 | pgprot_t prot = PAGE_KERNEL_LARGE; |
a2699e47 SS |
318 | /* |
319 | * first pass will use the same initial | |
320 | * identity mapping attribute + _PAGE_PSE. | |
321 | */ | |
322 | pgprot_t init_prot = | |
323 | __pgprot(PTE_IDENT_ATTR | | |
324 | _PAGE_PSE); | |
f3f20de8 | 325 | |
960ddb4f | 326 | pfn &= PMD_MASK >> PAGE_SHIFT; |
8550eb99 | 327 | addr2 = (pfn + PTRS_PER_PTE-1) * PAGE_SIZE + |
f3f20de8 JF |
328 | PAGE_OFFSET + PAGE_SIZE-1; |
329 | ||
8550eb99 IM |
330 | if (is_kernel_text(addr) || |
331 | is_kernel_text(addr2)) | |
f3f20de8 JF |
332 | prot = PAGE_KERNEL_LARGE_EXEC; |
333 | ||
ce0c0e50 | 334 | pages_2m++; |
a2699e47 SS |
335 | if (mapping_iter == 1) |
336 | set_pmd(pmd, pfn_pmd(pfn, init_prot)); | |
337 | else | |
338 | set_pmd(pmd, pfn_pmd(pfn, prot)); | |
b239fb25 | 339 | |
1da177e4 | 340 | pfn += PTRS_PER_PTE; |
8550eb99 IM |
341 | continue; |
342 | } | |
343 | pte = one_page_table_init(pmd); | |
1da177e4 | 344 | |
a04ad82d YL |
345 | pte_ofs = pte_index((pfn<<PAGE_SHIFT) + PAGE_OFFSET); |
346 | pte += pte_ofs; | |
347 | for (; pte_ofs < PTRS_PER_PTE && pfn < end_pfn; | |
8550eb99 IM |
348 | pte++, pfn++, pte_ofs++, addr += PAGE_SIZE) { |
349 | pgprot_t prot = PAGE_KERNEL; | |
a2699e47 SS |
350 | /* |
351 | * first pass will use the same initial | |
352 | * identity mapping attribute. | |
353 | */ | |
354 | pgprot_t init_prot = __pgprot(PTE_IDENT_ATTR); | |
f3f20de8 | 355 | |
8550eb99 IM |
356 | if (is_kernel_text(addr)) |
357 | prot = PAGE_KERNEL_EXEC; | |
f3f20de8 | 358 | |
ce0c0e50 | 359 | pages_4k++; |
c1fd1b43 | 360 | if (mapping_iter == 1) { |
a2699e47 | 361 | set_pte(pte, pfn_pte(pfn, init_prot)); |
c1fd1b43 PE |
362 | last_map_addr = (pfn << PAGE_SHIFT) + PAGE_SIZE; |
363 | } else | |
a2699e47 | 364 | set_pte(pte, pfn_pte(pfn, prot)); |
1da177e4 LT |
365 | } |
366 | } | |
367 | } | |
a2699e47 SS |
368 | if (mapping_iter == 1) { |
369 | /* | |
370 | * update direct mapping page count only in the first | |
371 | * iteration. | |
372 | */ | |
373 | update_page_count(PG_LEVEL_2M, pages_2m); | |
374 | update_page_count(PG_LEVEL_4K, pages_4k); | |
375 | ||
376 | /* | |
377 | * local global flush tlb, which will flush the previous | |
378 | * mappings present in both small and large page TLB's. | |
379 | */ | |
380 | __flush_tlb_all(); | |
381 | ||
382 | /* | |
383 | * Second iteration will set the actual desired PTE attributes. | |
384 | */ | |
385 | mapping_iter = 2; | |
386 | goto repeat; | |
387 | } | |
c1fd1b43 | 388 | return last_map_addr; |
ae531c26 AV |
389 | } |
390 | ||
1da177e4 | 391 | pte_t *kmap_pte; |
1da177e4 | 392 | |
8550eb99 IM |
393 | static inline pte_t *kmap_get_fixmap_pte(unsigned long vaddr) |
394 | { | |
e0c4f675 KS |
395 | pgd_t *pgd = pgd_offset_k(vaddr); |
396 | p4d_t *p4d = p4d_offset(pgd, vaddr); | |
397 | pud_t *pud = pud_offset(p4d, vaddr); | |
398 | pmd_t *pmd = pmd_offset(pud, vaddr); | |
399 | return pte_offset_kernel(pmd, vaddr); | |
8550eb99 | 400 | } |
1da177e4 LT |
401 | |
402 | static void __init kmap_init(void) | |
403 | { | |
404 | unsigned long kmap_vstart; | |
405 | ||
8550eb99 IM |
406 | /* |
407 | * Cache the first kmap pte: | |
408 | */ | |
1da177e4 LT |
409 | kmap_vstart = __fix_to_virt(FIX_KMAP_BEGIN); |
410 | kmap_pte = kmap_get_fixmap_pte(kmap_vstart); | |
1da177e4 LT |
411 | } |
412 | ||
fd940934 | 413 | #ifdef CONFIG_HIGHMEM |
1da177e4 LT |
414 | static void __init permanent_kmaps_init(pgd_t *pgd_base) |
415 | { | |
8550eb99 | 416 | unsigned long vaddr; |
1da177e4 | 417 | pgd_t *pgd; |
e0c4f675 | 418 | p4d_t *p4d; |
1da177e4 LT |
419 | pud_t *pud; |
420 | pmd_t *pmd; | |
421 | pte_t *pte; | |
1da177e4 LT |
422 | |
423 | vaddr = PKMAP_BASE; | |
424 | page_table_range_init(vaddr, vaddr + PAGE_SIZE*LAST_PKMAP, pgd_base); | |
425 | ||
426 | pgd = swapper_pg_dir + pgd_index(vaddr); | |
e0c4f675 KS |
427 | p4d = p4d_offset(pgd, vaddr); |
428 | pud = pud_offset(p4d, vaddr); | |
1da177e4 LT |
429 | pmd = pmd_offset(pud, vaddr); |
430 | pte = pte_offset_kernel(pmd, vaddr); | |
8550eb99 | 431 | pkmap_page_table = pte; |
1da177e4 LT |
432 | } |
433 | ||
1d931264 YL |
434 | void __init add_highpages_with_active_regions(int nid, |
435 | unsigned long start_pfn, unsigned long end_pfn) | |
1da177e4 | 436 | { |
8a9ca34c TH |
437 | phys_addr_t start, end; |
438 | u64 i; | |
439 | ||
fc6daaf9 | 440 | for_each_free_mem_range(i, nid, MEMBLOCK_NONE, &start, &end, NULL) { |
8a9ca34c TH |
441 | unsigned long pfn = clamp_t(unsigned long, PFN_UP(start), |
442 | start_pfn, end_pfn); | |
443 | unsigned long e_pfn = clamp_t(unsigned long, PFN_DOWN(end), | |
444 | start_pfn, end_pfn); | |
445 | for ( ; pfn < e_pfn; pfn++) | |
446 | if (pfn_valid(pfn)) | |
5e7ccf86 | 447 | free_highmem_page(pfn_to_page(pfn)); |
23be8c7d | 448 | } |
b5bc6c0e | 449 | } |
1da177e4 | 450 | #else |
e8e32326 IB |
451 | static inline void permanent_kmaps_init(pgd_t *pgd_base) |
452 | { | |
453 | } | |
1da177e4 LT |
454 | #endif /* CONFIG_HIGHMEM */ |
455 | ||
7737b215 | 456 | void __init native_pagetable_init(void) |
1da177e4 | 457 | { |
551889a6 | 458 | unsigned long pfn, va; |
73090f89 | 459 | pgd_t *pgd, *base = swapper_pg_dir; |
e0c4f675 | 460 | p4d_t *p4d; |
551889a6 IC |
461 | pud_t *pud; |
462 | pmd_t *pmd; | |
463 | pte_t *pte; | |
b239fb25 JF |
464 | |
465 | /* | |
551889a6 | 466 | * Remove any mappings which extend past the end of physical |
11ed9e92 YL |
467 | * memory from the boot time page table. |
468 | * In virtual address space, we should have at least two pages | |
469 | * from VMALLOC_END to pkmap or fixmap according to VMALLOC_END | |
470 | * definition. And max_low_pfn is set to VMALLOC_END physical | |
471 | * address. If initial memory mapping is doing right job, we | |
472 | * should have pte used near max_low_pfn or one pmd is not present. | |
b239fb25 | 473 | */ |
11ed9e92 | 474 | for (pfn = max_low_pfn; pfn < 1<<(32-PAGE_SHIFT); pfn++) { |
551889a6 IC |
475 | va = PAGE_OFFSET + (pfn<<PAGE_SHIFT); |
476 | pgd = base + pgd_index(va); | |
477 | if (!pgd_present(*pgd)) | |
478 | break; | |
479 | ||
e0c4f675 KS |
480 | p4d = p4d_offset(pgd, va); |
481 | pud = pud_offset(p4d, va); | |
551889a6 IC |
482 | pmd = pmd_offset(pud, va); |
483 | if (!pmd_present(*pmd)) | |
484 | break; | |
485 | ||
11ed9e92 YL |
486 | /* should not be large page here */ |
487 | if (pmd_large(*pmd)) { | |
488 | pr_warn("try to clear pte for ram above max_low_pfn: pfn: %lx pmd: %p pmd phys: %lx, but pmd is big page and is not using pte !\n", | |
489 | pfn, pmd, __pa(pmd)); | |
490 | BUG_ON(1); | |
491 | } | |
492 | ||
551889a6 IC |
493 | pte = pte_offset_kernel(pmd, va); |
494 | if (!pte_present(*pte)) | |
495 | break; | |
496 | ||
11ed9e92 YL |
497 | printk(KERN_DEBUG "clearing pte for ram above max_low_pfn: pfn: %lx pmd: %p pmd phys: %lx pte: %p pte phys: %lx\n", |
498 | pfn, pmd, __pa(pmd), pte, __pa(pte)); | |
551889a6 IC |
499 | pte_clear(NULL, va, pte); |
500 | } | |
6944a9c8 | 501 | paravirt_alloc_pmd(&init_mm, __pa(base) >> PAGE_SHIFT); |
843b8ed2 | 502 | paging_init(); |
b239fb25 JF |
503 | } |
504 | ||
b239fb25 JF |
505 | /* |
506 | * Build a proper pagetable for the kernel mappings. Up until this | |
507 | * point, we've been running on some set of pagetables constructed by | |
508 | * the boot process. | |
509 | * | |
510 | * If we're booting on native hardware, this will be a pagetable | |
551889a6 IC |
511 | * constructed in arch/x86/kernel/head_32.S. The root of the |
512 | * pagetable will be swapper_pg_dir. | |
b239fb25 JF |
513 | * |
514 | * If we're booting paravirtualized under a hypervisor, then there are | |
515 | * more options: we may already be running PAE, and the pagetable may | |
516 | * or may not be based in swapper_pg_dir. In any case, | |
7737b215 | 517 | * paravirt_pagetable_init() will set up swapper_pg_dir |
b239fb25 JF |
518 | * appropriately for the rest of the initialization to work. |
519 | * | |
520 | * In general, pagetable_init() assumes that the pagetable may already | |
521 | * be partially populated, and so it avoids stomping on any existing | |
522 | * mappings. | |
523 | */ | |
f765090a | 524 | void __init early_ioremap_page_table_range_init(void) |
b239fb25 | 525 | { |
e7179853 | 526 | pgd_t *pgd_base = swapper_pg_dir; |
8550eb99 | 527 | unsigned long vaddr, end; |
b239fb25 | 528 | |
1da177e4 LT |
529 | /* |
530 | * Fixed mappings, only the page table structure has to be | |
531 | * created - mappings will be set by set_fixmap(): | |
532 | */ | |
533 | vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK; | |
b239fb25 JF |
534 | end = (FIXADDR_TOP + PMD_SIZE - 1) & PMD_MASK; |
535 | page_table_range_init(vaddr, end, pgd_base); | |
beacfaac | 536 | early_ioremap_reset(); |
e7b37895 YL |
537 | } |
538 | ||
539 | static void __init pagetable_init(void) | |
540 | { | |
541 | pgd_t *pgd_base = swapper_pg_dir; | |
542 | ||
1da177e4 | 543 | permanent_kmaps_init(pgd_base); |
1da177e4 LT |
544 | } |
545 | ||
f955371c | 546 | pteval_t __supported_pte_mask __read_mostly = ~(_PAGE_NX | _PAGE_GLOBAL); |
6fdc05d4 JF |
547 | EXPORT_SYMBOL_GPL(__supported_pte_mask); |
548 | ||
90d967e0 YL |
549 | /* user-defined highmem size */ |
550 | static unsigned int highmem_pages = -1; | |
551 | ||
552 | /* | |
553 | * highmem=size forces highmem to be exactly 'size' bytes. | |
554 | * This works even on boxes that have no highmem otherwise. | |
555 | * This also works to reduce highmem size on bigger boxes. | |
556 | */ | |
557 | static int __init parse_highmem(char *arg) | |
558 | { | |
559 | if (!arg) | |
560 | return -EINVAL; | |
561 | ||
562 | highmem_pages = memparse(arg, &arg) >> PAGE_SHIFT; | |
563 | return 0; | |
564 | } | |
565 | early_param("highmem", parse_highmem); | |
566 | ||
4769843b IM |
567 | #define MSG_HIGHMEM_TOO_BIG \ |
568 | "highmem size (%luMB) is bigger than pages available (%luMB)!\n" | |
569 | ||
570 | #define MSG_LOWMEM_TOO_SMALL \ | |
571 | "highmem size (%luMB) results in <64MB lowmem, ignoring it!\n" | |
90d967e0 | 572 | /* |
4769843b IM |
573 | * All of RAM fits into lowmem - but if user wants highmem |
574 | * artificially via the highmem=x boot parameter then create | |
575 | * it: | |
90d967e0 | 576 | */ |
f836e35a | 577 | static void __init lowmem_pfn_init(void) |
90d967e0 | 578 | { |
346cafec | 579 | /* max_low_pfn is 0, we already have early_res support */ |
90d967e0 | 580 | max_low_pfn = max_pfn; |
d88316c2 | 581 | |
4769843b IM |
582 | if (highmem_pages == -1) |
583 | highmem_pages = 0; | |
584 | #ifdef CONFIG_HIGHMEM | |
585 | if (highmem_pages >= max_pfn) { | |
586 | printk(KERN_ERR MSG_HIGHMEM_TOO_BIG, | |
587 | pages_to_mb(highmem_pages), pages_to_mb(max_pfn)); | |
588 | highmem_pages = 0; | |
589 | } | |
590 | if (highmem_pages) { | |
591 | if (max_low_pfn - highmem_pages < 64*1024*1024/PAGE_SIZE) { | |
592 | printk(KERN_ERR MSG_LOWMEM_TOO_SMALL, | |
90d967e0 YL |
593 | pages_to_mb(highmem_pages)); |
594 | highmem_pages = 0; | |
595 | } | |
4769843b IM |
596 | max_low_pfn -= highmem_pages; |
597 | } | |
598 | #else | |
599 | if (highmem_pages) | |
600 | printk(KERN_ERR "ignoring highmem size on non-highmem kernel!\n"); | |
601 | #endif | |
602 | } | |
603 | ||
604 | #define MSG_HIGHMEM_TOO_SMALL \ | |
605 | "only %luMB highmem pages available, ignoring highmem size of %luMB!\n" | |
606 | ||
607 | #define MSG_HIGHMEM_TRIMMED \ | |
608 | "Warning: only 4GB will be used. Use a HIGHMEM64G enabled kernel!\n" | |
609 | /* | |
610 | * We have more RAM than fits into lowmem - we try to put it into | |
611 | * highmem, also taking the highmem=x boot parameter into account: | |
612 | */ | |
f836e35a | 613 | static void __init highmem_pfn_init(void) |
4769843b | 614 | { |
d88316c2 IM |
615 | max_low_pfn = MAXMEM_PFN; |
616 | ||
4769843b IM |
617 | if (highmem_pages == -1) |
618 | highmem_pages = max_pfn - MAXMEM_PFN; | |
619 | ||
620 | if (highmem_pages + MAXMEM_PFN < max_pfn) | |
621 | max_pfn = MAXMEM_PFN + highmem_pages; | |
622 | ||
623 | if (highmem_pages + MAXMEM_PFN > max_pfn) { | |
624 | printk(KERN_WARNING MSG_HIGHMEM_TOO_SMALL, | |
625 | pages_to_mb(max_pfn - MAXMEM_PFN), | |
626 | pages_to_mb(highmem_pages)); | |
627 | highmem_pages = 0; | |
628 | } | |
90d967e0 | 629 | #ifndef CONFIG_HIGHMEM |
4769843b IM |
630 | /* Maximum memory usable is what is directly addressable */ |
631 | printk(KERN_WARNING "Warning only %ldMB will be used.\n", MAXMEM>>20); | |
632 | if (max_pfn > MAX_NONPAE_PFN) | |
633 | printk(KERN_WARNING "Use a HIGHMEM64G enabled kernel.\n"); | |
634 | else | |
635 | printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n"); | |
636 | max_pfn = MAXMEM_PFN; | |
90d967e0 YL |
637 | #else /* !CONFIG_HIGHMEM */ |
638 | #ifndef CONFIG_HIGHMEM64G | |
4769843b IM |
639 | if (max_pfn > MAX_NONPAE_PFN) { |
640 | max_pfn = MAX_NONPAE_PFN; | |
641 | printk(KERN_WARNING MSG_HIGHMEM_TRIMMED); | |
642 | } | |
90d967e0 YL |
643 | #endif /* !CONFIG_HIGHMEM64G */ |
644 | #endif /* !CONFIG_HIGHMEM */ | |
4769843b IM |
645 | } |
646 | ||
647 | /* | |
648 | * Determine low and high memory ranges: | |
649 | */ | |
650 | void __init find_low_pfn_range(void) | |
651 | { | |
652 | /* it could update max_pfn */ | |
653 | ||
d88316c2 | 654 | if (max_pfn <= MAXMEM_PFN) |
4769843b | 655 | lowmem_pfn_init(); |
d88316c2 IM |
656 | else |
657 | highmem_pfn_init(); | |
90d967e0 YL |
658 | } |
659 | ||
b2ac82a0 | 660 | #ifndef CONFIG_NEED_MULTIPLE_NODES |
d8fc3afc | 661 | void __init initmem_init(void) |
b2ac82a0 | 662 | { |
b2ac82a0 YL |
663 | #ifdef CONFIG_HIGHMEM |
664 | highstart_pfn = highend_pfn = max_pfn; | |
665 | if (max_pfn > max_low_pfn) | |
666 | highstart_pfn = max_low_pfn; | |
b2ac82a0 YL |
667 | printk(KERN_NOTICE "%ldMB HIGHMEM available.\n", |
668 | pages_to_mb(highend_pfn - highstart_pfn)); | |
b2ac82a0 YL |
669 | high_memory = (void *) __va(highstart_pfn * PAGE_SIZE - 1) + 1; |
670 | #else | |
b2ac82a0 YL |
671 | high_memory = (void *) __va(max_low_pfn * PAGE_SIZE - 1) + 1; |
672 | #endif | |
0608f70c | 673 | |
e7e8de59 | 674 | memblock_set_node(0, (phys_addr_t)ULLONG_MAX, &memblock.memory, 0); |
0608f70c TH |
675 | sparse_memory_present_with_active_regions(0); |
676 | ||
b2ac82a0 | 677 | #ifdef CONFIG_FLATMEM |
46a84132 | 678 | max_mapnr = IS_ENABLED(CONFIG_HIGHMEM) ? highend_pfn : max_low_pfn; |
b2ac82a0 | 679 | #endif |
dc16ecf7 JF |
680 | __vmalloc_start_set = true; |
681 | ||
b2ac82a0 YL |
682 | printk(KERN_NOTICE "%ldMB LOWMEM available.\n", |
683 | pages_to_mb(max_low_pfn)); | |
684 | ||
685 | setup_bootmem_allocator(); | |
b2ac82a0 | 686 | } |
cb95a13a | 687 | #endif /* !CONFIG_NEED_MULTIPLE_NODES */ |
b2ac82a0 | 688 | |
b2ac82a0 YL |
689 | void __init setup_bootmem_allocator(void) |
690 | { | |
b2ac82a0 YL |
691 | printk(KERN_INFO " mapped low ram: 0 - %08lx\n", |
692 | max_pfn_mapped<<PAGE_SHIFT); | |
fc5efe39 | 693 | printk(KERN_INFO " low ram: 0 - %08lx\n", max_low_pfn<<PAGE_SHIFT); |
4e29684c YL |
694 | } |
695 | ||
1da177e4 LT |
696 | /* |
697 | * paging_init() sets up the page tables - note that the first 8MB are | |
698 | * already mapped by head.S. | |
699 | * | |
700 | * This routines also unmaps the page at virtual kernel address 0, so | |
701 | * that we can trap those pesky NULL-reference errors in the kernel. | |
702 | */ | |
703 | void __init paging_init(void) | |
704 | { | |
1da177e4 LT |
705 | pagetable_init(); |
706 | ||
1da177e4 LT |
707 | __flush_tlb_all(); |
708 | ||
709 | kmap_init(); | |
11cd0bc1 YL |
710 | |
711 | /* | |
712 | * NOTE: at this point the bootmem allocator is fully available. | |
713 | */ | |
c10d1e26 | 714 | olpc_dt_build_devicetree(); |
797390d8 | 715 | sparse_memory_present_with_active_regions(MAX_NUMNODES); |
11cd0bc1 YL |
716 | sparse_init(); |
717 | zone_sizes_init(); | |
1da177e4 LT |
718 | } |
719 | ||
720 | /* | |
721 | * Test if the WP bit works in supervisor mode. It isn't supported on 386's | |
f7f17a67 DV |
722 | * and also on some strange 486's. All 586+'s are OK. This used to involve |
723 | * black magic jumps to work around some nasty CPU bugs, but fortunately the | |
724 | * switch to using exceptions got rid of all that. | |
1da177e4 | 725 | */ |
1da177e4 LT |
726 | static void __init test_wp_bit(void) |
727 | { | |
4af17110 | 728 | char z = 0; |
6415813b | 729 | |
952a6c2c | 730 | printk(KERN_INFO "Checking if this processor honours the WP bit even in supervisor mode..."); |
1da177e4 | 731 | |
4af17110 | 732 | __set_fixmap(FIX_WP_TEST, __pa_symbol(empty_zero_page), PAGE_KERNEL_RO); |
1da177e4 | 733 | |
952a6c2c BP |
734 | if (probe_kernel_write((char *)fix_to_virt(FIX_WP_TEST), &z, 1)) { |
735 | clear_fixmap(FIX_WP_TEST); | |
736 | printk(KERN_CONT "Ok.\n"); | |
737 | return; | |
1da177e4 | 738 | } |
4af17110 | 739 | |
952a6c2c BP |
740 | printk(KERN_CONT "No.\n"); |
741 | panic("Linux doesn't support CPUs with broken WP."); | |
1da177e4 LT |
742 | } |
743 | ||
1da177e4 LT |
744 | void __init mem_init(void) |
745 | { | |
cfb80c9e JF |
746 | pci_iommu_alloc(); |
747 | ||
05b79bdc | 748 | #ifdef CONFIG_FLATMEM |
8d8f3cbe | 749 | BUG_ON(!mem_map); |
1da177e4 | 750 | #endif |
855c743a SG |
751 | /* |
752 | * With CONFIG_DEBUG_PAGEALLOC initialization of highmem pages has to | |
753 | * be done before free_all_bootmem(). Memblock use free low memory for | |
754 | * temporary data (see find_range_array()) and for this purpose can use | |
755 | * pages that was already passed to the buddy allocator, hence marked as | |
756 | * not accessible in the page tables when compiled with | |
757 | * CONFIG_DEBUG_PAGEALLOC. Otherwise order of initialization is not | |
758 | * important here. | |
759 | */ | |
760 | set_highmem_pages_init(); | |
761 | ||
1da177e4 | 762 | /* this will put all low memory onto the freelists */ |
0c988534 | 763 | free_all_bootmem(); |
1da177e4 | 764 | |
4e37a890 YL |
765 | after_bootmem = 1; |
766 | ||
46a84132 | 767 | mem_init_print_info(NULL); |
d7d119d7 | 768 | printk(KERN_INFO "virtual kernel memory layout:\n" |
8550eb99 | 769 | " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" |
92a0f81d | 770 | " cpu_entry : 0x%08lx - 0x%08lx (%4ld kB)\n" |
052e7994 | 771 | #ifdef CONFIG_HIGHMEM |
8550eb99 | 772 | " pkmap : 0x%08lx - 0x%08lx (%4ld kB)\n" |
052e7994 | 773 | #endif |
8550eb99 IM |
774 | " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" |
775 | " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n" | |
776 | " .init : 0x%08lx - 0x%08lx (%4ld kB)\n" | |
777 | " .data : 0x%08lx - 0x%08lx (%4ld kB)\n" | |
778 | " .text : 0x%08lx - 0x%08lx (%4ld kB)\n", | |
779 | FIXADDR_START, FIXADDR_TOP, | |
780 | (FIXADDR_TOP - FIXADDR_START) >> 10, | |
052e7994 | 781 | |
92a0f81d TG |
782 | CPU_ENTRY_AREA_BASE, |
783 | CPU_ENTRY_AREA_BASE + CPU_ENTRY_AREA_MAP_SIZE, | |
784 | CPU_ENTRY_AREA_MAP_SIZE >> 10, | |
785 | ||
052e7994 | 786 | #ifdef CONFIG_HIGHMEM |
8550eb99 IM |
787 | PKMAP_BASE, PKMAP_BASE+LAST_PKMAP*PAGE_SIZE, |
788 | (LAST_PKMAP*PAGE_SIZE) >> 10, | |
052e7994 JF |
789 | #endif |
790 | ||
8550eb99 IM |
791 | VMALLOC_START, VMALLOC_END, |
792 | (VMALLOC_END - VMALLOC_START) >> 20, | |
052e7994 | 793 | |
8550eb99 IM |
794 | (unsigned long)__va(0), (unsigned long)high_memory, |
795 | ((unsigned long)high_memory - (unsigned long)__va(0)) >> 20, | |
052e7994 | 796 | |
8550eb99 IM |
797 | (unsigned long)&__init_begin, (unsigned long)&__init_end, |
798 | ((unsigned long)&__init_end - | |
799 | (unsigned long)&__init_begin) >> 10, | |
052e7994 | 800 | |
8550eb99 IM |
801 | (unsigned long)&_etext, (unsigned long)&_edata, |
802 | ((unsigned long)&_edata - (unsigned long)&_etext) >> 10, | |
052e7994 | 803 | |
8550eb99 IM |
804 | (unsigned long)&_text, (unsigned long)&_etext, |
805 | ((unsigned long)&_etext - (unsigned long)&_text) >> 10); | |
052e7994 | 806 | |
beeb4195 JB |
807 | /* |
808 | * Check boundaries twice: Some fundamental inconsistencies can | |
809 | * be detected at build time already. | |
810 | */ | |
811 | #define __FIXADDR_TOP (-PAGE_SIZE) | |
812 | #ifdef CONFIG_HIGHMEM | |
813 | BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP*PAGE_SIZE > FIXADDR_START); | |
814 | BUILD_BUG_ON(VMALLOC_END > PKMAP_BASE); | |
815 | #endif | |
816 | #define high_memory (-128UL << 20) | |
817 | BUILD_BUG_ON(VMALLOC_START >= VMALLOC_END); | |
818 | #undef high_memory | |
819 | #undef __FIXADDR_TOP | |
820 | ||
052e7994 | 821 | #ifdef CONFIG_HIGHMEM |
8550eb99 IM |
822 | BUG_ON(PKMAP_BASE + LAST_PKMAP*PAGE_SIZE > FIXADDR_START); |
823 | BUG_ON(VMALLOC_END > PKMAP_BASE); | |
052e7994 | 824 | #endif |
beeb4195 | 825 | BUG_ON(VMALLOC_START >= VMALLOC_END); |
8550eb99 | 826 | BUG_ON((unsigned long)high_memory > VMALLOC_START); |
052e7994 | 827 | |
6415813b | 828 | test_wp_bit(); |
1da177e4 LT |
829 | } |
830 | ||
ad8f5797 | 831 | #ifdef CONFIG_MEMORY_HOTPLUG |
3d79a728 | 832 | int arch_add_memory(int nid, u64 start, u64 size, bool want_memblock) |
05039b92 | 833 | { |
05039b92 DH |
834 | unsigned long start_pfn = start >> PAGE_SHIFT; |
835 | unsigned long nr_pages = size >> PAGE_SHIFT; | |
836 | ||
3d79a728 | 837 | return __add_pages(nid, start_pfn, nr_pages, want_memblock); |
05039b92 | 838 | } |
24d335ca WC |
839 | |
840 | #ifdef CONFIG_MEMORY_HOTREMOVE | |
841 | int arch_remove_memory(u64 start, u64 size) | |
842 | { | |
843 | unsigned long start_pfn = start >> PAGE_SHIFT; | |
844 | unsigned long nr_pages = size >> PAGE_SHIFT; | |
845 | struct zone *zone; | |
846 | ||
847 | zone = page_zone(pfn_to_page(start_pfn)); | |
848 | return __remove_pages(zone, start_pfn, nr_pages); | |
849 | } | |
850 | #endif | |
9d99aaa3 | 851 | #endif |
05039b92 | 852 | |
502f6604 | 853 | int kernel_set_to_readonly __read_mostly; |
16239630 SR |
854 | |
855 | void set_kernel_text_rw(void) | |
856 | { | |
857 | unsigned long start = PFN_ALIGN(_text); | |
858 | unsigned long size = PFN_ALIGN(_etext) - start; | |
859 | ||
860 | if (!kernel_set_to_readonly) | |
861 | return; | |
862 | ||
863 | pr_debug("Set kernel text: %lx - %lx for read write\n", | |
864 | start, start+size); | |
865 | ||
866 | set_pages_rw(virt_to_page(start), size >> PAGE_SHIFT); | |
867 | } | |
868 | ||
869 | void set_kernel_text_ro(void) | |
870 | { | |
871 | unsigned long start = PFN_ALIGN(_text); | |
872 | unsigned long size = PFN_ALIGN(_etext) - start; | |
873 | ||
874 | if (!kernel_set_to_readonly) | |
875 | return; | |
876 | ||
877 | pr_debug("Set kernel text: %lx - %lx for read only\n", | |
878 | start, start+size); | |
879 | ||
880 | set_pages_ro(virt_to_page(start), size >> PAGE_SHIFT); | |
881 | } | |
882 | ||
5bd5a452 MC |
883 | static void mark_nxdata_nx(void) |
884 | { | |
885 | /* | |
886 | * When this called, init has already been executed and released, | |
0d2eb44f | 887 | * so everything past _etext should be NX. |
5bd5a452 MC |
888 | */ |
889 | unsigned long start = PFN_ALIGN(_etext); | |
890 | /* | |
891 | * This comes from is_kernel_text upper limit. Also HPAGE where used: | |
892 | */ | |
893 | unsigned long size = (((unsigned long)__init_end + HPAGE_SIZE) & HPAGE_MASK) - start; | |
894 | ||
895 | if (__supported_pte_mask & _PAGE_NX) | |
896 | printk(KERN_INFO "NX-protecting the kernel data: %luk\n", size >> 10); | |
897 | set_pages_nx(virt_to_page(start), size >> PAGE_SHIFT); | |
898 | } | |
899 | ||
63aaf308 AV |
900 | void mark_rodata_ro(void) |
901 | { | |
6fb14755 JB |
902 | unsigned long start = PFN_ALIGN(_text); |
903 | unsigned long size = PFN_ALIGN(_etext) - start; | |
63aaf308 | 904 | |
4e4eee0e MD |
905 | set_pages_ro(virt_to_page(start), size >> PAGE_SHIFT); |
906 | printk(KERN_INFO "Write protecting the kernel text: %luk\n", | |
907 | size >> 10); | |
0c42f392 | 908 | |
16239630 SR |
909 | kernel_set_to_readonly = 1; |
910 | ||
0c42f392 | 911 | #ifdef CONFIG_CPA_DEBUG |
4e4eee0e MD |
912 | printk(KERN_INFO "Testing CPA: Reverting %lx-%lx\n", |
913 | start, start+size); | |
914 | set_pages_rw(virt_to_page(start), size>>PAGE_SHIFT); | |
0c42f392 | 915 | |
4e4eee0e MD |
916 | printk(KERN_INFO "Testing CPA: write protecting again\n"); |
917 | set_pages_ro(virt_to_page(start), size>>PAGE_SHIFT); | |
602033ed | 918 | #endif |
8f0f996e | 919 | |
6fb14755 JB |
920 | start += size; |
921 | size = (unsigned long)__end_rodata - start; | |
6d238cc4 | 922 | set_pages_ro(virt_to_page(start), size >> PAGE_SHIFT); |
d7d119d7 IM |
923 | printk(KERN_INFO "Write protecting the kernel read-only data: %luk\n", |
924 | size >> 10); | |
63aaf308 | 925 | |
0c42f392 | 926 | #ifdef CONFIG_CPA_DEBUG |
d7d119d7 | 927 | printk(KERN_INFO "Testing CPA: undo %lx-%lx\n", start, start + size); |
6d238cc4 | 928 | set_pages_rw(virt_to_page(start), size >> PAGE_SHIFT); |
0c42f392 | 929 | |
d7d119d7 | 930 | printk(KERN_INFO "Testing CPA: write protecting again\n"); |
6d238cc4 | 931 | set_pages_ro(virt_to_page(start), size >> PAGE_SHIFT); |
0c42f392 | 932 | #endif |
5bd5a452 | 933 | mark_nxdata_nx(); |
e1a58320 SS |
934 | if (__supported_pte_mask & _PAGE_NX) |
935 | debug_checkwx(); | |
63aaf308 | 936 | } |